Compilare: user.cpp: In function ‘int main()’: user.cpp:60:6: warning: unused variable ‘dest’ [-Wunused-variable] int dest = g[x][0].first; ^ user.cpp:62:6: warning: unused variable ‘par’ [-Wunused-variable] int par = x; ^ user.cpp:46:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d %d", &n, &m, &x, &y); ^ user.cpp:52:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d", &u, &v, &cost); ^